Battery charging method, device, equipment and vehicle

Abstract

The present application relates to a battery charging method, device, equipment and vehicle, and relates to the technical field of vehicles. The method includes: determining the maximum cooling capacity allocated by the vehicle's refrigeration system to the battery according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's passenger compartment; charging the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum cooling capacity. It is used to ensure the charging safety of the battery.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, especially the technical field of vehicle thermal management, and particularly relates to a battery charging method, device, equipment, and vehicle. Background Art

[0002] Currently, the charge rate (C) of the power battery of a vehicle at high temperatures has reached a relatively high level (such as 4C or 6C). In fact, in a high-temperature environment, charging the power battery at a high charge rate will cause the heat generated by the battery to be greater than the heat dissipation of the vehicle's thermal management system, breaking the balance between the heat generation power and the cooling power, resulting in a rapid increase in the battery temperature during fast charging.

[0003] To improve the charging efficiency, an optimization method for a lithium battery charging strategy is disclosed in one technical solution. The optimization method includes: if the highest temperature that the lithium battery can reach is higher than the reference highest temperature and the corresponding current is also greater than the reference current, then adjust the charging current in the current charging strategy, and advance the regulation of the charging current to delay the temperature rise rate of the battery cell and limit the highest temperature of the battery cell, thereby extending the time of medium and high-rate charging, and then improving the charging efficiency on the premise of ensuring charging safety. Another technical solution also discloses a charging control method, which includes: performing charging operations on each battery one by one through multiple rounds of charging by charging control, thereby solving the problem that the battery will be continuously at a high temperature during the charging process in the prior art, and improving the charging safety and charging efficiency of the energy storage device by implementing different charging strategies.

[0004] It can be seen that the current technical solutions are all aimed at increasing the charge rate of the power battery. However, in the case of a high charge rate, the temperature of the battery will rise rapidly. If the vehicle's refrigeration system cannot effectively cool the battery, it will cause the risk of lithium plating and thermal runaway during high-temperature charging of the battery, thus unable to ensure the charging safety of the battery. Summary of the Invention

[0005] This application provides a battery charging method, device, equipment, and vehicle for ensuring the charging safety of the battery. The technical solution of this application is as follows:

[0006] According to the first aspect provided by this application, a battery charging method is provided. The method includes: determining the maximum cooling capacity allocated by the vehicle's refrigeration system to the battery according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's passenger compartment. Charging the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum cooling capacity.

[0007] According to the above technical means, based on the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's passenger compartment, the maximum refrigeration capacity is allocated to the battery, and the charging control parameters matching the maximum refrigeration capacity are determined. Further, according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters, the battery is charged. In this way, a charging strategy is provided for the battery within the refrigeration capacity configured by the refrigeration system for the battery, avoiding thermal runaway of the battery, thereby ensuring the charging safety of the battery.

[0008] In one possible way, the above method further includes: obtaining a plurality of initial charging strategies according to the current operating parameters of the battery and the reference maximum allowable peaking current (MAP). The initial charging strategy with the smallest charging parameter among the plurality of initial charging strategies is used as the target charging strategy.

[0009] In one possible way, the charging control parameters include one or more of the following: charging duration; the highest temperature of the battery during charging; the temperature of the battery at the end of charging.

[0010] In one possible way, charging the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters includes: when the charging parameters of the target charging strategy and the charging control parameters meet the charging conditions, charging the battery according to the target charging strategy.

[0011] In one possible way, the above method further includes: when the target charging parameters corresponding to the target charging strategy and the charging control parameters do not meet the charging conditions, adjusting the target charging strategy to obtain an adjusted charging strategy, so that the charging parameters corresponding to the adjusted charging strategy and the charging control parameters meet the charging conditions.

[0012] In one possible way, the above method further includes: adjusting the target charging strategy to obtain an adjusted charging strategy, including: determining an adjustment coefficient of the target charging strategy according to the difference between the charging parameters corresponding to the target charging strategy and the charging control parameters, and adjusting the target charging strategy according to the adjustment coefficient to obtain an adjusted charging strategy.

[0013] In one possible way, adjusting the target charging strategy includes: adjusting the charging rate in the target charging parameters, and / or adjusting the charging duration in the target charging parameters.

[0014] In one possible way, the charging condition is that the charging parameter is less than or equal to the charging control parameter, or the difference between the charging parameter and the charging control parameter is less than or equal to the target threshold.

[0015] In a possible way, according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's occupant compartment, determine the maximum refrigeration capacity allocated by the vehicle's refrigeration system to the battery, including: determining the refrigeration capacity allocated by the vehicle's refrigeration system to the occupant compartment according to the current refrigeration demand of the vehicle's occupant compartment and the ambient temperature in which the vehicle is located. Determine the maximum refrigeration capacity of the battery according to the refrigeration capacity of the vehicle's refrigeration system and the refrigeration capacity of the occupant compartment.

[0016] According to the above technical means, configure the refrigeration capacity for the occupant compartment according to the refrigeration demand of the occupant compartment, and configure the maximum refrigeration capacity for the battery. In this way, when cooling the battery, the refrigeration capacity of the occupant compartment is satisfied, and the comfort of the occupant compartment during the charging process is improved.

[0017] In a possible way, according to the current refrigeration demand of the vehicle's occupant compartment and the ambient temperature in which the vehicle is located, determine the refrigeration capacity allocated by the vehicle's refrigeration system to the occupant compartment, including: determining the initial refrigeration capacity according to the current refrigeration demand of the vehicle's occupant compartment and the ambient temperature in which the vehicle is located, and when the initial refrigeration capacity is greater than or equal to the refrigeration capacity threshold, reduce the initial refrigeration capacity, and determine the reduced refrigeration capacity as the refrigeration capacity of the occupant compartment.

[0018] According to the above technical means, when a relatively large initial refrigeration capacity is configured for the occupant compartment, reduce the refrigeration capacity configured for the occupant compartment, so that more refrigeration capacity can be allocated to the battery, and then the battery can be cooled better.

[0019] According to the second aspect provided by the present application, provide a battery charging device, the device includes: a determination unit and a processing unit. The determination unit is used to determine the maximum refrigeration capacity allocated by the vehicle's refrigeration system to the battery according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's occupant compartment. The processing unit is used to charge the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum refrigeration capacity.

[0020] In a possible way, the processing unit is further used to: obtain a plurality of initial charging strategies according to the current operating parameters of the battery and the reference maximum allowable charging current MAP. The processing unit is further used to: use the initial charging strategy with the smallest charging parameter among the plurality of initial charging strategies as the target charging strategy.

[0021] In a possible way, the charging control parameters include one or more of the following: charging duration; the highest temperature of the battery during charging; the temperature of the battery at the end of charging.

[0022] In a possible way, the processing unit is specifically used to: when the charging parameters of the target charging strategy and the charging control parameters meet the charging conditions, charge the battery according to the target charging strategy.

[0023] In one possible way, the processing unit is further configured to: when the target charging parameters corresponding to the target charging strategy do not meet the charging conditions with the charging control parameters, adjust the target charging strategy to obtain an adjusted charging strategy, so that the charging parameters corresponding to the adjusted charging strategy meet the charging conditions with the charging control parameters.

[0024] In one possible way, the processing unit is specifically configured to: determine an adjustment coefficient of the target charging strategy according to the difference between the charging parameters corresponding to the target charging strategy and the charging control parameters, and adjust the target charging strategy according to the adjustment coefficient to obtain an adjusted charging strategy.

[0025] In one possible way, the processing unit is specifically configured to: adjust the charging rate in the target charging parameters, and / or adjust the charging duration in the target charging parameters.

[0026] In one possible way, the charging condition is that the charging parameters are less than or equal to the charging control parameters, or the difference between the charging parameters and the charging control parameters is less than or equal to the target threshold.

[0027] In one possible way, the determining unit is specifically configured to: determine the cooling capacity allocated by the vehicle's cooling system to the passenger compartment according to the current cooling demand of the passenger compartment of the vehicle and the ambient temperature in which the vehicle is located. Determine the maximum cooling capacity of the battery according to the cooling capacity of the vehicle's cooling system and the cooling capacity of the passenger compartment.

[0028] In one possible way, the determining unit is specifically configured to: determine an initial cooling capacity according to the current cooling demand of the passenger compartment of the vehicle and the ambient temperature in which the vehicle is located, and when the initial cooling capacity is greater than or equal to the cooling capacity threshold, reduce the initial cooling capacity, and determine the reduced cooling capacity as the cooling capacity of the passenger compartment.

[0029] According to the third aspect provided by the present application, there is provided an in-vehicle device, including: a processor; a memory for storing instructions executable by the processor; wherein, the processor is configured to execute the instructions to implement the method according to the first aspect and any one of its possible implementation manners.

[0030] According to the fourth aspect provided by the present application, there is provided a computer-readable storage medium, when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is caused to execute the method according to the first aspect and any one of its possible implementation manners.

[0031] According to a fifth aspect provided by the present application, there is provided a computer program product, which includes computer instructions. When the computer instructions run on an electronic device, the electronic device is caused to execute the method according to the first aspect and any possible implementation manner thereof as described above.

[0032] According to a sixth aspect provided by the present application, there is provided a vehicle, which includes an in-vehicle device as described in the third aspect.

[0033] It should be noted that for the technical effects brought by any implementation manner in the second aspect to the sixth aspect, reference may be made to the technical effects brought by the corresponding implementation manner in the first aspect, and details are not described herein again.

[0034] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application, and do not constitute an improper limitation to the present application.

[0036] Figure 1 It is a schematic structural diagram of a vehicle refrigeration system shown according to an exemplary embodiment;

[0037] Figure 2 It is one of the schematic flowcharts of a battery charging method shown according to an exemplary embodiment;

[0038] Figure 3 It is a schematic diagram of temperature rise comparison before and after optimization of the charging rate of a battery shown according to an exemplary embodiment;

[0039] Figure 4 It is a schematic diagram of power comparison before and after optimization of the charging rate of a battery shown according to an exemplary embodiment;

[0040] Figure 5 It is another schematic flowchart of a battery charging method shown according to an exemplary embodiment;

[0041] Figure 6 It is still another schematic flowchart of a battery charging method shown according to an exemplary embodiment;

[0042] Figure 7 It is a schematic structural diagram of a battery charging device shown according to an exemplary embodiment;

[0043] Figure 8 It is a schematic structural diagram of an in-vehicle device shown according to an exemplary embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] To enable those of ordinary skill in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. On the contrary, they are merely examples of devices and methods consistent with some aspects of this application as detailed in the appended claims.

[0046] As described in the background art, in the case of high charging rates, the temperature of the battery will rise rapidly. If the vehicle's refrigeration system cannot effectively cool the battery, it will cause the battery to have a risk of lithium plating and thermal runaway during high-temperature charging, thus unable to ensure the charging safety of the battery.

[0047] Specifically, currently, the charging rate of the battery in a high-temperature environment has reached 4C, and even 6C. However, high-rate charging of the battery in a high-temperature environment does not necessarily result in the shortest charging time. Instead, it will cause the internal temperature of the battery to rise rapidly, and the heat generation is far greater than the heat dissipation of the single-on battery refrigeration of the vehicle's thermal management, which has broken the balance between the heating power and the cooling power, resulting in a rapid rise in the battery temperature during high-rate charging. Subsequently, if the temperature of the battery reaches the temperature critical value due to high-rate charging, the actual charging rate of the battery will decrease sharply, and then the charging duration will also increase as the rate decreases.

[0048] To solve the above technical problems, the battery charging method provided by the embodiments of this application includes: determining the maximum cooling capacity allocated to the battery by the vehicle's refrigeration system according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's passenger compartment. Charging the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum cooling capacity.

[0049] In this way, according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's passenger compartment, the maximum cooling capacity is allocated to the battery, and the charging control parameters matching the maximum cooling capacity are determined. Further, the battery is charged according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters. In this way, a charging strategy is provided for the battery within the refrigeration capacity configured by the refrigeration system for the battery, avoiding thermal runaway of the battery, and thus ensuring the charging safety of the battery.

[0050] AsFigure 1 As shown Figure 1 Figure 1 is a schematic structural diagram of a vehicle refrigeration system 100 shown according to an exemplary embodiment. The vehicle refrigeration system 100 may include in-vehicle equipment 101, a battery 102, and a passenger compartment 103. The in-vehicle equipment 101 is communicatively connected to the battery 102 and the passenger compartment 103 respectively.

[0051] The in-vehicle equipment 101 is configured to determine the maximum cooling capacity allocated by the vehicle refrigeration system to the battery according to the refrigeration capacity of the vehicle refrigeration system and the current refrigeration demand of the vehicle passenger compartment. The in-vehicle equipment 101 is further configured to charge the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum cooling capacity.

[0052] The in-vehicle equipment 101 may be the main controller of the vehicle or the controller of the vehicle thermal management system. The embodiments of the present application do not make specific limitations on the in-vehicle equipment 101.

[0053] The battery 102 may be a ternary lithium battery, a lithium iron phosphate battery, or a solid-state battery. In this regard, the embodiments of the present application do not make specific limitations on the battery 102.

[0054] For ease of understanding, the battery charging method provided by the present application will be specifically introduced below with reference to the accompanying drawings.

[0055] Figure 2 Figure 2 is a schematic flowchart of a battery charging method shown according to an exemplary embodiment. The method includes: S201 - S202.

[0056] S201. Determine the maximum cooling capacity allocated by the vehicle refrigeration system to the battery according to the refrigeration capacity of the vehicle refrigeration system and the current refrigeration demand of the vehicle passenger compartment.

[0057] In some embodiments, when the vehicle is in a charging state, the in-vehicle equipment obtains the maximum charging rate of the vehicle battery, and when the maximum charging rate of the vehicle battery is greater than or equal to the charging rate threshold, determines the maximum cooling capacity allocated by the vehicle refrigeration system to the battery and the cooling capacity of the passenger compartment according to the total cooling capacity of the vehicle and the refrigeration demand of the passenger compartment.

[0058] It should be noted that the charging rate threshold is pre-configured. Exemplarily, the charging rate threshold may be 4C or 6C. In this regard, the embodiments of the present application do not make specific limitations.

[0059] In some embodiments, the in-vehicle device determines the refrigeration demand of the passenger compartment in response to the user's cooling configuration operation on the passenger compartment, and determines the maximum refrigeration capacity allocated to the battery by the vehicle's refrigeration system and the refrigeration capacity of the passenger compartment according to the total refrigeration capacity of the vehicle and the refrigeration demand of the vehicle's passenger compartment.

[0060] For example, the in-vehicle device obtains the refrigeration temperature and the air volume of the air output configured by the user for the passenger compartment, and determines the refrigeration demand of the passenger compartment according to the refrigeration temperature and the air volume. Further, the in-vehicle device determines the refrigeration capacity allocated to the passenger compartment by the vehicle's refrigeration system according to the refrigeration demand, and determines the maximum refrigeration capacity of the battery according to the total refrigeration capacity of the vehicle and the refrigeration capacity of the passenger compartment.

[0061] For another example, the refrigeration demand includes the refrigeration temperature. The in-vehicle device determines the refrigeration capacity allocated to the passenger compartment by the vehicle's refrigeration system according to the refrigeration temperature and the ambient temperature of the vehicle, and determines the maximum refrigeration capacity allocated to the battery by the vehicle's refrigeration system according to the total refrigeration capacity and the refrigeration capacity of the passenger compartment.

[0062] S202. Charge the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum refrigeration capacity.

[0063] As a possible implementation manner, the in-vehicle device determines the charging control parameters according to the maximum refrigeration capacity and the performance parameters of the battery. Among them, the charging control parameters are used to characterize the extreme values of the battery's charging parameters during the charging process.

[0064] In some embodiments, the in-vehicle device inputs the maximum refrigeration capacity and the performance parameters of the battery into the first reference value algorithm to obtain the charging control parameters.

[0065] In other embodiments, the in-vehicle device inputs the maximum refrigeration capacity, the performance parameters of the battery, and the ambient temperature of the vehicle into the second reference value algorithm to obtain the charging control parameters.

[0066] It should be noted that the first reference value algorithm and the second reference value algorithm are pre-configured in the in-vehicle device.

[0067] In the embodiments of the present application, the charging control parameters include one or more of the highest control temperature of the battery during charging, the discharge control power of the battery, the charging control duration, and the end control temperature at the end of charging.

[0068] As another possible implementation manner, the in-vehicle device determines the charging control parameters according to the driving demand power, the maximum refrigeration capacity, and the performance parameters of the battery.

[0069] In the embodiments of the present application, the driving demand power can be used to determine the control temperature (or discharge power) when the battery ends charging and the charging control duration.

[0070] It can be understood that the discharge power of the battery is strongly correlated with the temperature. Among them, since the charging rate of the battery decreases in the later stage of charging, the battery temperature during charging is often higher than the charging temperature at the end of charging. If the charging temperature is too high during or at the end of charging, it will cause the battery discharge power to be too low to meet the driving demand. Therefore, the maximum control temperature of the battery during charging or the control temperature when the battery ends charging is obtained according to the driving demand power.

[0071] In some embodiments, the vehicle-mounted device determines the target charging parameters corresponding to the target charging strategy and determines whether the target charging parameters corresponding to the target charging strategy and the charging control parameters meet the charging conditions. Further, when the target charging parameters corresponding to the target charging strategy and the charging control parameters meet the charging conditions, the vehicle-mounted device charges the battery according to the target charging strategy. When the target charging parameters corresponding to the target charging strategy and the charging control parameters do not meet the charging conditions, the target charging strategy is adjusted to obtain an adjusted charging strategy so that the charging parameters corresponding to the adjusted charging strategy and the charging control parameters meet the charging conditions.

[0072] In the embodiments of the present application, the charging condition is that the charging parameter is less than or equal to the charging control parameter, or the difference between the charging parameter and the charging control parameter is less than or equal to the target threshold.

[0073] Exemplarily, taking the charging control parameters including the maximum control temperature and the charging control duration as an example, the vehicle-mounted device determines whether the maximum temperature in the target charging parameters is less than or equal to the maximum control temperature, and whether the charging duration in the target charging parameters is less than or equal to the charging control duration. If so, the battery is charged according to the target charging strategy. If not, the target charging strategy is adjusted.

[0074] Exemplarily, taking the charging control parameters including the maximum control temperature and the charging control duration as an example, the vehicle-mounted device obtains a control comprehensive value according to the maximum control temperature and the charging control duration, and determines a target comprehensive value according to the maximum temperature and the charging duration in the target charging parameters. Further, the vehicle-mounted device determines whether the target comprehensive value is less than or equal to the control comprehensive value. If so, the battery is charged according to the target charging strategy.

[0075] Another exemplarily, taking the charging control parameters including the maximum control temperature and the charging control duration as an example, the vehicle-mounted device determines whether the maximum temperature in the target charging parameters is less than or equal to the maximum control temperature. If so, the battery is charged according to the target charging strategy.

[0076] In some other embodiments, when the target charging parameters corresponding to the target charging strategy and the charging control parameters do not meet the charging conditions, the target charging strategy is adjusted to obtain an adjusted charging strategy. When the charging parameters and the charging control parameters of the adjusted charging strategy meet the charging conditions, the battery is charged according to the adjusted charging strategy.

[0077] The adjustment of the target charging strategy in the embodiments of the present application includes: adjusting the charging rate in the target charging parameters, and / or adjusting the charging duration in the target charging parameters.

[0078] In some embodiments, the charging rate in the target charging strategy is adjusted. For example, the charging rate in the target charging strategy is adjusted by a rate adjustment coefficient. For example, taking the rate adjustment coefficient as 0.85, the product of 0.85 and the charging rate in the target charging strategy is used as the charging rate of the adjusted charging strategy. For another example, if the charging rate in the target charging strategy is 5.5C, then the part exceeding 3C is multiplied by the rate adjustment coefficient 0.65 to obtain the charging rate of the adjusted charging strategy, so as to reduce the maximum rate.

[0079] In some other embodiments, the charging rate in the target charging strategy is adjusted according to the highest control temperature. For example, when the highest control temperature is 55°C and the charging rate in the target charging strategy is greater than 2.5C, the charging rate in the target charging strategy is adjusted to 2.5C.

[0080] In some embodiments, the target charging strategy is adjusted according to the target charging parameters corresponding to the target charging strategy and the charging control parameters to obtain an adjusted charging strategy. For example, the adjustment coefficient of the target charging strategy is determined according to the difference between the charging parameters and the charging control parameters corresponding to the target charging strategy, and the target charging strategy is adjusted according to the adjustment coefficient to obtain an adjusted charging strategy.

[0081] The battery charging method provided by the embodiments of the present application has at least the following beneficial effects: According to the refrigeration capacity of the refrigeration system of the vehicle and the current refrigeration demand of the passenger compartment of the vehicle, the maximum refrigeration amount is allocated to the battery, and the charging control parameters matching the maximum refrigeration amount are determined. In this way, a charging strategy is provided for the battery within the refrigeration capacity configured by the refrigeration system for the battery, avoiding thermal runaway of the battery, and thus ensuring the charging safety of the battery.

[0082] In Figure 3 shows a schematic diagram of the temperature rise comparison before and after the optimization of the charging rate of the battery. Specifically, Figure 3The vertical axis represents the battery temperature, and the horizontal axis represents the charging time (in seconds). The temperature rise curve 1 represents the temperature fluctuation curve before the charging rate is optimized, and the temperature rise curve 2 represents the temperature fluctuation curve after the charging rate is optimized. It can be seen that after the charging rate is optimized, the temperature of the battery rises slowly, and the battery temperature is relatively low for a long time, which can better protect the battery.

[0083] In Figure 4 A schematic diagram of the power comparison before and after the charging rate of the battery is optimized is shown. Specifically, Figure 4 The vertical axis represents the charging power, and the horizontal axis represents the charging time (in seconds). The charging power curve 1 represents the charging power fluctuation curve before the charging rate is optimized, and the charging power curve 2 represents the charging power fluctuation curve after the charging rate is optimized. It can be seen that after the charging rate is optimized, the charging power of the battery is relatively stable, which can better protect the battery.

[0084] In one design, in order to determine an accurate charging strategy, the battery charging method provided in the embodiments of the present application further includes: S203 - S204.

[0085] S203. Obtain a plurality of initial charging strategies according to the current operating parameters of the battery and the reference maximum allowable charging current MAP.

[0086] As a possible implementation manner, the in - vehicle device obtains the current operating parameters of the battery, and obtains a plurality of initial charging strategies according to the current operating parameters of the battery and the maximum allowable charging current MAP.

[0087] The operating parameters of the battery in the embodiments of the present application include the cell temperature of the battery and / or the state of charge (SOC) of the battery.

[0088] In some embodiments, before charging the battery, the in - vehicle device obtains the operating parameters of the battery, and selects a charging strategy according to the operating parameters of the battery and the reference MAP to obtain a plurality of initial charging strategies.

[0089] The charging strategy in the embodiments of the present application can be understood as a charging path. The charging strategy is used to indicate the charging rate (or charging current) of the battery in each charging stage.

[0090] S204. Use the initial charging strategy with the smallest charging parameter among the plurality of initial charging strategies as the target charging strategy.

[0091] In some embodiments, the in - vehicle device obtains the charging parameter of each initial charging strategy according to each initial charging strategy, the maximum cooling capacity, and the thermoelectric coupling model.

[0092] In the embodiments of the present application, the charging parameters include one or more of the maximum temperature of the battery during charging, the end temperature at which charging ends, and the charging duration.

[0093] In some embodiments, when the vehicle-mounted device obtains multiple charging parameters, it determines the target charging strategy based on the initial charging strategy corresponding to the minimum charging parameter among the multiple charging parameters. It can be understood that the initial charging strategy with the lowest temperature and the shortest charging time is the candidate charging strategy.

[0094] In some embodiments, when the lowest temperature and the shortest charging time are respectively located in different charging parameters, a weighted sum of the maximum temperature, the end temperature, and the charging duration is calculated to obtain the initial comprehensive value. Further, the minimum comprehensive value among the multiple comprehensive values is determined as the target comprehensive value, and the initial charging strategy corresponding to the target comprehensive value is determined as the target charging strategy.

[0095] In other embodiments, when the lowest temperature and the shortest charging time are respectively located in different charging parameters, the target charging parameter is determined according to the charging requirement. For example, if the user needs fast charging, the charging parameter with the shortest charging duration among the multiple initial charging values is used as the target charging parameter, and the initial charging strategy corresponding to the target charging parameter is determined as the target charging strategy.

[0096] It can be understood that the optimal charging strategy is determined according to the current operating parameters of the battery and the reference MAP, and it is determined whether the optimal charging strategy meets the charging requirement. Further, when the optimal charging strategy meets the charging requirement, the battery is charged according to the optimal charging strategy. In this way, a suitable charging strategy can be matched to quickly charge the battery while ensuring the safety of the battery.

[0097] In one design, in order to improve the comfort of the passenger compartment and enhance the user's riding experience, the above S201 includes: S2011 - S2012.

[0098] S2011. Determine the cooling capacity allocated by the vehicle's cooling system to the passenger compartment according to the current cooling requirement of the vehicle's passenger compartment and the environmental temperature where the vehicle is located.

[0099] As a possible implementation manner, the vehicle-mounted device obtains the current cooling requirement of the passenger compartment and the environmental temperature, and determines the cooling capacity allocated by the vehicle's cooling system to the passenger compartment according to the current cooling requirement of the passenger compartment and the environmental temperature where the vehicle is located.

[0100] In some embodiments, the vehicle-mounted device obtains the cooling temperature of the passenger compartment, and determines the cooling capacity allocated by the vehicle's cooling system to the passenger compartment according to the cooling temperature, the environmental temperature, and the temperature correspondence relationship. The temperature correspondence relationship is the correspondence relationship for determining the cooling capacity according to the cooling temperature and the environmental temperature.

[0101] In some embodiments, the in-vehicle device determines the cooling capacity allocated to the passenger compartment by the vehicle's cooling system according to the cooling temperature, the ambient temperature, and the cooling function.

[0102] It should be noted that the cooling function is a pre-configured function.

[0103] In some other embodiments, the in-vehicle device determines the initial cooling capacity of the passenger compartment according to the cooling temperature and the ambient temperature, and adjusts the initial cooling capacity to reduce it when the initial cooling capacity is greater than or equal to the cooling capacity threshold. Further, the in-vehicle device determines the reduced cooling capacity as the cooling capacity of the passenger compartment.

[0104] It can be understood that when allocating more cooling capacity to the passenger compartment, in order to ensure the cooling capacity of the battery, the cooling capacity allocated to the passenger compartment is reduced.

[0105] S2012. Determine the maximum cooling capacity of the battery according to the cooling capacity of the vehicle's cooling system and the cooling capacity of the passenger compartment.

[0106] In some embodiments, the in-vehicle device determines the total cooling capacity of the cooling system according to the cooling capacity of the vehicle's cooling system, and determines the maximum cooling capacity of the battery according to the total cooling capacity and the cooling capacity of the passenger compartment.

[0107] According to the above technical means, the cooling capacity is allocated to the passenger compartment according to the cooling demand of the passenger compartment, and the maximum cooling capacity is allocated to the battery. In this way, when cooling the battery, the cooling capacity of the passenger compartment is satisfied, and the comfort of the passenger compartment during the charging process is improved.

[0108] To better understand the battery charging method provided by the embodiments of the present application, as Figure 5 shown, a schematic flowchart of a battery charging method is shown, including: S301 - S306.

[0109] S301. Obtain the ambient temperature of the vehicle.

[0110] In some embodiments, the in-vehicle device obtains the current ambient temperature by using an ambient temperature sensor.

[0111] In some embodiments, the in-vehicle device determines the first heat exchange coefficient between the battery and the environment where the vehicle is located according to the current ambient temperature, and determines the second heat exchange coefficient between the passenger compartment and the environment where the vehicle is located.

[0112] S302. Obtain the total cooling capacity of the vehicle.

[0113] In some embodiments, the in-vehicle device determines the total cooling capacity of the vehicle based on the cooling parameters and the high and low pressure values of the vehicle's thermal management system.

[0114] Understandably, based on the hardware of the vehicle's overall thermal management system arranged in the vehicle and the high and low voltage capabilities of the system, the overall cooling capacity of the current vehicle's thermal management system is obtained for parameter input in subsequent calculations.

[0115] S303. Determine the working mode of the vehicle's thermal management system.

[0116] In some embodiments, before the in-vehicle device charges the battery, it obtains the working mode of the thermal management system.

[0117] In the single-on mode of the battery for the working mode, allocate the total cooling capacity of the vehicle to the battery. In the dual-on mode or multi-on mode for the working mode, based on the cooling demand of the device to be cooled (such as the occupant compartment) and the total cooling capacity, allocate the maximum cooling capacity to the battery and allocate the cooling capacity to the device to be cooled. Further, based on the maximum cooling capacity allocated to the battery, the first heat exchange coefficient, and the reference MAP, determine multiple initial charging strategies. Further, determine the target charging strategy from the multiple initial charging strategies, and determine whether the target charging parameter corresponding to the target charging strategy is less than or equal to the charging control parameter. Subsequently, when the target charging parameter is less than or equal to the charging control parameter, charge the battery according to the target charging strategy. See the above S203 for details of this step.

[0118] In one case, based on the cooling capacity of the battery and the reference MAP, calculate the highest temperature and charging duration that the battery temperature can reach under multiple initial charging strategies, and compare the calculated highest temperature with the highest control temperature. If the highest temperature is less than the highest control temperature, select the charging strategy with the shortest charging time and the lowest battery temperature during charging among the multiple charging strategies for charging. Otherwise, optimize the charging rate under the high-rate charging path calculated, reduce the charging duration and charging rate, thereby extending the charging duration of the rate and controlling the temperature rise, and recalculate the highest temperature according to the processed charging path, and finally make it always meet the controlled highest reference temperature.

[0119] S304. Determine the cooling capacity of the occupant compartment.

[0120] In some embodiments, determine the cooling capacity of the occupant compartment according to the cooling temperature of the occupant compartment.

[0121] In some other embodiments, determine the cooling capacity of the occupant compartment according to the cooling temperature of the occupant compartment, the ambient temperature, and the second heat exchange coefficient.

[0122] In some other embodiments, to ensure a certain level of comfort in the occupant compartment during charging, determine the cooling capacity required for the people in the occupant compartment to be at a comfortable temperature according to the ambient temperature, and determine this cooling capacity as the cooling capacity of the occupant compartment.

[0123] S305. Determine the cooling capacity of the battery.

[0124] In some embodiments, the cooling capacity of the battery is determined according to the total cooling capacity of the vehicle and the cooling capacity of the occupant compartment.

[0125] S306. Determine the heat exchange amount of the battery.

[0126] In some embodiments, the heat exchange amount of the battery is determined according to the cooling capacity of the battery and the heat exchange efficiency of the battery.

[0127] In some other embodiments, the heat exchange amount of the battery is determined according to the cooling capacity of the battery, the heat exchange efficiency of the battery, the ambient temperature, and the first heat exchange coefficient.

[0128] To better understand the battery charging method provided in the embodiments of the present application, as Figure 6 shown, a schematic flowchart of a battery charging method is shown, including: S401 - S408.

[0129] S401. Obtain the ambient temperature, the operating parameters of the battery, and the heat exchange amount of the battery.

[0130] In the embodiments of the present application, the heat exchange amount of the battery includes the heat exchange amount between the battery and the environment and the heat exchange amount between the battery and the thermal management system.

[0131] S402. Obtain a plurality of initial charging strategies according to the operating parameters of the battery and the reference MAP.

[0132] S403. Determine the target charging strategy.

[0133] S404. Determine the target charging parameters.

[0134] S405. Determine whether the target charging parameters are less than or equal to the charging reference value compared with the charging control parameters.

[0135] If so, execute S406. If not, execute S407.

[0136] S406. Charge the battery according to the current charging strategy.

[0137] S407. Adjust the target charging strategy to obtain the adjusted charging strategy.

[0138] S408. Determine the charging parameters of the adjusted charging strategy.

[0139] In some embodiments, when the charging parameters of the adjusted charging strategy are determined, execute S405.

[0140] The above mainly introduces the solution provided by the embodiments of the present application from the perspective of methods. To implement the above functions, the communication device includes the corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should easily realize that, combining the units and algorithm steps of each example described in the embodiments disclosed in this article, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0141] Figure 7 is a schematic structural diagram of a battery charging device shown according to an exemplary embodiment. Referring to Figure 7 , the battery charging device 50 includes: a determination unit 501 and a processing unit 502.

[0142] The determination unit 501 is configured to determine the maximum cooling capacity allocated by the vehicle's refrigeration system to the battery according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's occupant compartment. The processing unit 502 is configured to charge the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum cooling capacity.

[0143] In a possible way, the processing unit 502 is further configured to: obtain a plurality of initial charging strategies according to the current operating parameters of the battery and the reference maximum allowable charging current MAP. The processing unit 502 is further configured to: use the initial charging strategy with the smallest charging parameter among the plurality of initial charging strategies as the target charging strategy.

[0144] In a possible way, the charging control parameters include one or more of the following: charging duration; the highest temperature of the battery during charging; the temperature of the battery at the end of charging.

[0145] In a possible way, the processing unit 502 is specifically configured to: charge the battery according to the target charging strategy when the charging parameters of the target charging strategy and the charging control parameters meet the charging conditions.

[0146] In a possible way, the processing unit 502 is further configured to: adjust the target charging strategy when the target charging parameters corresponding to the target charging strategy and the charging control parameters do not meet the charging conditions, to obtain an adjusted charging strategy, so that the charging parameters corresponding to the adjusted charging strategy and the charging control parameters meet the charging conditions.

[0147] In one possible way, the processing unit 502 is specifically configured to: determine an adjustment coefficient of the target charging strategy according to the difference between the charging parameters and the charging control parameters corresponding to the target charging strategy, and adjust the target charging strategy according to the adjustment coefficient to obtain an adjusted charging strategy.

[0148] In one possible way, the processing unit 502 is specifically configured to: adjust the charging rate in the target charging parameters, and / or adjust the charging duration in the target charging parameters.

[0149] In one possible way, the charging condition is that the charging parameters are less than or equal to the charging control parameters, or the difference between the charging parameters and the charging control parameters is less than or equal to the target threshold.

[0150] In one possible way, the determining unit 501 is specifically configured to: determine the cooling capacity allocated by the vehicle's cooling system to the passenger compartment according to the current cooling demand of the vehicle's passenger compartment and the environmental temperature in which the vehicle is located. Determine the maximum cooling capacity of the battery according to the cooling capacity of the vehicle's cooling system and the cooling capacity of the passenger compartment.

[0151] In one possible way, the determining unit 501 is specifically configured to: determine the initial cooling capacity according to the current cooling demand of the vehicle's passenger compartment and the environmental temperature in which the vehicle is located, and reduce the initial cooling capacity when the initial cooling capacity is greater than or equal to the cooling capacity threshold, and determine the reduced cooling capacity as the cooling capacity of the passenger compartment.

[0152] Figure 8 It is a schematic structural diagram of a vehicle-mounted device shown according to an exemplary embodiment. As Figure 8 shown, the vehicle-mounted device includes but is not limited to: a processor 601, a memory 602, an input device 603, and an output device 604.

[0153] Among them, the above-mentioned memory 602 is used to store the executable instructions of the above-mentioned processor 601. It can be understood that the above-mentioned processor 601 is configured to execute instructions to implement the battery charging method in the above-mentioned embodiment.

[0154] It should be noted that those skilled in the art can understand that Figure 8 the structure of the vehicle-mounted device shown in Figure 8 does not constitute a limitation on the vehicle-mounted device. The vehicle-mounted device may include more or fewer components than

[0155] The processor 601 is the control center of the vehicle-mounted device, connecting various parts of the entire vehicle-mounted device through various interfaces and lines. By running or executing software programs and / or modules stored in the memory 602, and by calling the data stored in the memory 602, it executes various functions of the vehicle-mounted device and processes data, thereby monitoring the vehicle-mounted device as a whole. The processor 601 may include one or more processing units. Optionally, the processor 601 may integrate an application processor and a modem processor. Among them, the application processor mainly processes the operating system, user interface, application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor may not be integrated into the processor 601 either.

[0156] The memory 602 can be used to store software programs and various data. The memory 602 mainly includes a program storage area and a data storage area. Among them, the program storage area can store the operating system, application programs required by at least one functional module (such as a determination unit, a processing unit, etc.). In addition, the memory 602 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0157] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as the memory 602 including instructions. The above instructions can be executed by the processor 601 of the vehicle-mounted device to implement the method in the above embodiment.

[0158] The input device 603 can be used to input the operating parameters of the battery, the ambient temperature, and the configured temperature of the passenger compartment, etc.

[0159] The output device 604 can be used to output the first cooling capacity of the passenger compartment and the second cooling capacity of the battery, etc.

[0160] Optionally, the computer-readable storage medium may be a non-transitory computer-readable storage medium. For example, the non-transitory computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0161] In an exemplary embodiment, the embodiment of the present application also provides a computer program product including one or more instructions. The one or more instructions can be executed by the processor 601 of the vehicle-mounted device to complete the method in the above embodiment.

[0162] It should be noted that when one or more instructions in the above computer-readable storage medium or the computer program product are executed by the processor of the vehicle-mounted device, the various processes of the above method embodiments are implemented, and the same technical effects as the above method can be achieved. To avoid repetition, they will not be elaborated here.

[0163] From the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0164] In several embodiments provided in this application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical or other forms.

[0165] The units described as separate components may or may not be physically separated. The components displayed as units may be one physical unit or multiple physical units, that is, they can be located in one place, or they can be distributed to multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0166] In addition, in each embodiment of this application, each functional unit can be integrated in one processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0167] When an integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiments of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions for causing a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the methods of the embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical discs.

[0168] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery charging method, characterized in that: The method comprises: determining a maximum cooling capacity of a refrigeration system of the vehicle allocated to the battery based on a refrigeration capacity of the refrigeration system of the vehicle and a current refrigeration demand of a passenger compartment of the vehicle; When a target charging strategy corresponding to the current operating parameters of the battery and a charging control parameter matching the maximum cooling capacity meet charging conditions, charging the battery according to the target charging strategy; When the target charging parameters corresponding to the target charging strategy and the charging control parameters do not meet the charging conditions, the adjustment coefficient of the target charging strategy is determined according to the difference between the charging parameters corresponding to the target charging strategy and the charging control parameters, and the target charging strategy is adjusted according to the adjustment coefficient to obtain the adjusted charging strategy, so that the charging parameters corresponding to the adjusted charging strategy and the charging control parameters meet the charging conditions.

2. The method according to claim 1, characterized in that The method further comprises: Obtaining a plurality of initial charging strategies according to current operating parameters of the battery and a reference maximum allowable charging current MAP; The initial charging strategy with the smallest charging parameter among the multiple initial charging strategies is used as the target charging strategy.

3. The method according to claim 2, characterized in that The charging control parameters include one or more of the following: Charging time; the maximum temperature of the battery during charging; The temperature of the battery at the end of charging.

4. The method according to claim 1, characterized in that: The adjusting the target charging strategy includes: adjusting the charging rate in the target charging parameter, and / or adjusting the charging duration in the target charging parameter.

5. The method according to claim 1, characterized in that The charging condition is that the charging parameter is less than or equal to the charging control parameter, or the difference between the charging parameter and the charging control parameter is less than or equal to a target threshold.

6. The method according to any one of claims 1 to 3, characterized in that The determining, based on the refrigeration capacity of the refrigeration system of the vehicle and the current refrigeration demand of the passenger compartment of the vehicle, a maximum refrigeration capacity allocated to the battery by the refrigeration system of the vehicle comprises: Determining a cooling capacity allocated to the passenger compartment by a refrigeration system of the vehicle according to a current cooling demand of the passenger compartment of the vehicle and an ambient temperature of the vehicle; The maximum cooling capacity of the battery is determined according to the cooling capacity of the cooling system of the vehicle and the cooling capacity of the passenger compartment.

7. The method according to claim 6, characterized in that The step of determining the cooling capacity allocated to the passenger compartment by the refrigeration system of the vehicle according to the current cooling demand of the passenger compartment of the vehicle and the ambient temperature of the vehicle comprises: An initial cooling capacity is determined based on a current cooling demand of the passenger compartment of the vehicle and an ambient temperature of the vehicle, and when the initial cooling capacity is greater than or equal to a cooling capacity threshold, the initial cooling capacity is reduced, and the reduced cooling capacity is determined as the cooling capacity of the passenger compartment.

8. A battery charging device, characterized in that: The device comprises: a determination unit and a processing unit; The determination unit is configured to determine a maximum cooling capacity allocated to the battery by the refrigeration system of the vehicle according to a refrigeration capacity of the refrigeration system of the vehicle and a current refrigeration demand of a passenger compartment of the vehicle; The processing unit is configured to charge the battery according to the target charging strategy when the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum cooling capacity meet the charging conditions; The processing unit is further used for: when the target charging parameters corresponding to the target charging strategy and the charging control parameters do not meet the charging conditions, determining the adjustment coefficient of the target charging strategy according to the difference between the charging parameters corresponding to the target charging strategy and the charging control parameters, and adjusting the target charging strategy according to the adjustment coefficient to obtain the adjusted charging strategy, so that the charging parameters corresponding to the adjusted charging strategy and the charging control parameters meet the charging conditions.

9. A vehicle-mounted device, characterized in that: including memory and processor; The memory is coupled to the processor; The memory is used to store computer program code, wherein the computer program code includes computer instructions; When the processor executes the computer instructions, the in-vehicle device executes the method according to any one of claims 1-7.

10. A vehicle, characterized in that: The vehicle includes the vehicle-mounted device according to claim 9.

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